Flatirons 

From what I've heard, there are ice climbs that form in the southern Flatirons and even up near MMW....

I've done two ice climbs in the southern Flatirons. A three-pitch-or-so line forms almost every November of December up an otherwise undistinguished crag high on Bear Peak, to the south of Shanahan Crag. A fairly obvious talus slope diagonals up and left to reach it. A good three- or four-pitch line formed one year in the late 80s or early 90s up the middle of the east face of the Goose. We called it Wild Goose Chase, but I think Greg Davis and a partner had climbed it the week before (and probably Gary Neptune years before that). Both were fun and interesting and impossible to rate, like true alpine climbs: thin ice and mixed scratching on the 50-degree Flatiron slabs. Every Boulder ice climber should do one of these Flatiron ice climbs someday. They're unique and right in our backyard.